Ann: Noosa Mining and Exploration Conference Presentation, page-12

"minerable".
Dear oh dear, what sort of word is that? Thought I had better google it just in case there was some esoteric meaning that I was not familiar with. Well, the top of the list was "unMineable - Mine your favorite non-mineable crypto coin", followed by "Mintable.app - The best marketplace for artists and sellers of digital items" and "Miserable | Definition of Miserable by Merriam-Webster".
Get the picture? A nonsense word that people can make up their own meaning for. Perhaps it is deliberate obfuscation in order to avoid revealing the truth of the matter.
My best guess would be "containing a mineral". Wow. It must all be economic in that case. The word has a nice ring to it don't you think? "able" is so suggestive. Yippee, we are all going to be rich.
Thank God for international standards protecting us from this sort of thing. The naive are unprotectable it seems.